package com.tenxun.controller;

public class wasd {
    private wasd w;
    private wasd(){}
    public wasd gets(){
        if(w == null) {
            w = new wasd();
        }
        return w;
    }
}

class A{
    private A aa=new A();
    private A(){}
    public A geta(){
        return aa;
    }
}